Writing instrument



FIG. 1 is a top end view of a writing instrument embodying my invention;

FIG. 2 is a bottom end view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 rear elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a perspective view thereof.

The stippling shown in all drawings represents surface shading and forms no part of the claimed design. 

The ornamental design for a writing instrument, as shown and described. 